<?php
/**
 * Copyright (c) 2011 by Bohdan Padalko <bohdan.padalko@gmail.com>
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. */

class TH_EventModel {
    private $callbacks = array();

    public function bind($event, $callback) {
        if (!array_key_exists($event, $this->callbacks)){
            $this->callbacks[$event] = array();
        }

        array_push($this->callbacks[$event], $callback);
        return $this;
    }

    public function unbind($event, $callback=NULL) {
        if (array_key_exists($event, $this->callbacks)){
            if (NULL == $callback) {
                unset($this->callbacks[$event]);
            } else {
                for($i=0; $i<sizeof($this->callbacks[$event]); $i++) {
                    if ($this->callbacks[$event][$i] === $callback) {
                        unset($this->callbacks[$event][$i]);
                        break;
                    }
                }
            }
        }
        return $this;
    }

    public function emmit($event, $_=NULL) {
        $args = func_num_args();
        if ($_ == NULL) {
            $args = array();
        } else {
            array_shift($args);
        }
        array_unshift($args, $this);

        if (array_key_exists($event, $this->callbacks)){
            for($i=0; $i<sizeof($this->callbacks[$event]); $i++) {
                // TODO: check returned result and if it negetive stop chain reaction (but FALSE is used for error)
                call_user_func_array($this->callbacks[$event][$i], $args);
            }
        }

        return $this;
    }
}

?>